improve WC_EXTRA_MAKEFILE warning

currently if open_default_makefile() finds a standard makefile it will
print info message but then warn about the same file being "additional."

	[nrk mklint master]% ./mklint
	./mklint: [info] found standard makefile to use: Makefile (-wmakefile)
	./mklint: [warn] found additional standard makefile: Makefile (-wextra-makefile)

this makes it so that it doesn't produce warning about the the makefile
that it already found as "additional."

also declares the default_makefiles pointer as const for good measures.

1 files changed, 4 insertions, 3 deletions

diff --git a/mklint.c b/mklint.c
index aec636e..1c17eea 100644
--- a/mklint.c
+++ b/mklint.c
@@ -7,7 +7,7 @@ NUSAGE(EXIT_ERROR, "[-f makefile]");
 
 int exit_status = 0;
 
-static const char *default_makefiles[] = {
+static const char *const default_makefiles[] = {
 	"makefile",
 	"Makefile"
 };
@@ -41,9 +41,10 @@ open_default_makefile(const char **pathp)
 	            "alternatives are ./makefile and ./Makefile");
 
 find_existing_fallbacks:
-	for (; i < ELEMSOF(default_makefiles); i++)
+	for (i++; i < ELEMSOF(default_makefiles); i++)
 		if (!access(default_makefiles[i], F_OK))
-			warnf_warning(WC_EXTRA_MAKEFILE, "found additional standard makefile: %s", *pathp);
+			warnf_warning(WC_EXTRA_MAKEFILE, "found additional standard makefile: %s",
+			              default_makefiles[i]);
 
 	return fd;
 }